Not quite yet
In 1942, according to Monte Irvin, many owners believed that he was the best player in the Negro Leagues, but after going into the military, he needed time to polish his skills. 56K | 300KSource: MLB Productions

Piece of cake
Monte Irvin says with Leon Day pitching, the Negro Leaguers often defeated the Major Leaguers. 56K | 300KSource: MLB Productions